1/1: Building CoverBug (CoverBug.idr)
Error: doit is not covering.

CoverBug:20:1--20:26
 16 | fromInteger v =
 17 |   let (v ** p) = prv1 $ v
 18 |   in MkFastNat v
 19 | 
 20 | doit : FastNat -> FastNat
      ^^^^^^^^^^^^^^^^^^^^^^^^^

Missing cases:
    doit MkFastNat _